One troy ounce is 31.103487 grams.
An ounce avoirdupois is 28.349 grams.
One metric tonne is 1 million grams or 2204.66 lbs.
1 gram per metric tonne is equal to .029 troy ounces troy per short ton.
The formula for this is grams X 0.029167
Why is this? Because short tons are 2000/2204.66 smaller than metric tons, so they have less gold in them. There are fewer ounces per ton in a short ton than there are in a larger metric tonne. The metric tonne has more gold in it, for the same ratio.
There are 29,166.66 troy ounces in one short ton. (A short ton is 907,168 grams -- 907,168/31.103487 = 29167.66 Ozs-Troy) So one ounce per short ton is a ratio of 1/29,166.66
This same ratio of one ounce per short ton - in a metric ton is 1,000,000/29,166.66 = 34.285 grams per metric tonne.
If you really want to get confused try comparing fluid ounces and other fluid measure in the US and Canada. Quarts and pints and gallons. A US quart is different, as is a US fluid ounce. A CDN quart is 40 fluid ounces. The US quart is defined to be 32 fluid ounces, but the two fluid ounces are different, so the of used comparison of a US quart to an imperial quart being 80%, is incorrect. In fact a US quart is 33.28 ounces avdp of water, and a CDN quart is 40 ounces avdp of water. A US gallon is therefore 0.832 of a CDN gallon, not 80%.
A CDN gallon of the old type, is exactly 4.546 litres. A US gallon is 3.785 litres. You will rarely see these conversions used, but they are the correct ones.
A CDN quart of water weighs 2.5 lbs. The imperial fluid ounce is nearly exactly one ounce avoirdupois. Not so the US fluid ounce.
* The Imperial fluid ounce is 1/160 of an imperial gallon or 1/20 of an imperial pint or 8 fluid drams, about 1.734 cubic inches or 28.4130625 millilitres.[1] This volume of water weighs very nearly 1 avoirdupois ounce (it is the volume occupied by one ounce at 62 °F (16.7 °C), weighed in air with brass weights).
* The U.S. fluid ounce is defined to be 1/128 of a U.S. gallon or 1/16 of a U.S. pint, exactly 1.8046875 cubic inches or 29.5735295625 milliliters. This volume of cool, pure water weighs about 1.04 avoirdupois ounces (29.5 g).
* U.S. regulation 21 CFR 101.9(b)(5)(viii) also defines a fluid ounce as exactly 30 ml, but this is for use in nutrition labeling only.[2] These two definitions, one using English units and one metric, are not meant to concur exactly and are a common source of confusion. |
